addressing coding style rules

var/spack/repos/builtin/packages/py-jinja2/package.py

@@ -1,25 +1,27 @@
-from spack import *
+from spack import depends_on, extends, python, version
+from spack import Package
+
 
 class PyJinja2(Package):
     """
     Jinja2 is a template engine written in pure Python. It provides
-    a Django inspired non-XML syntax but supports inline expressions 
+    a Django inspired non-XML syntax but supports inline expressions
     and an optional sandboxed environment.
     """
 
     homepage = "http://jinja.pocoo.org/"
     url      = "https://github.com/pallets/jinja/archive/2.8.tar.gz"
 
-    version('2.8'  , '4114200650d7630594e3bc70af23f59e')
+    version('2.8', '4114200650d7630594e3bc70af23f59e')
     version('2.7.3', '55b87bdc8e585b8b5b86734eefce2621')
     version('2.7.2', '8e8f226809ae6363009b9296e30adf30')
     version('2.7.1', '69b6675553c81b1087f95cae7f2179bb')
-    version('2.7'  , 'ec70433f325051dcedacbb2465028a35')
+    version('2.7', 'ec70433f325051dcedacbb2465028a35')
 
     extends("python")
     depends_on("py-setuptools")
     depends_on("py-markupsafe")
-    
+
     def install(self, spec, prefix):
         python('setup.py', 'install', '--prefix=%s' % prefix)